Dummy's Guide to RV WiringWiring the 7 pole RV Tow Vehicle Socket
There are two wiring codes for different 7 pole plug sets.
Most RV's use the RV wiring code for the type of plug/socket that has 6 flat contacts surrounding the center round pin.
Semi's and other commercial trailers use the ASME (American Society of Mechanical Engineers) type of 7-pole plug set. This plug has 6 round contacts surrounding the center pin.The wiring color code for this plug is not the same as the RV 7 pole plug described below, and will be included at a future time.
|#||Wire Color||Function||Location - Truck socket||Location Trailer plug|
|1||White||Ground||7:00 o'clock||5:00 o'clock|
|2||Blue||Brakes||5:00 o'clock||7:00 o'clock|
|3||Green||Running||10:00 o'clock||2:00 o'clock|
|4||Black||Power||2:00 o'clock||10:00 o'clock|
|5||Red||LT & Stop||9:00 o'clock||3:00 o'clock|
|6||Brown||RT & Stop||3:00 o'clock||9:00 o'clock|
|7||Yellow||Aux or BU||Center||Center|